2009

7.3

2014

3.9

1999

7.0

1998

6.3

1980

6.4

1984

6.8

2004

6.6

2006

6.5

1998

6.9

2006

6.5

1993

7.3

1978

6.3

2004

7.1

2002

6.1

1995

7.1

1998

6.3

2005

6.3

1978

6.7

1973

4.2

2000

6.8